STYLE 40x40 - Roof window for motorhomes and campervans (with 100cm² permanent ventilation)

The STYLE 40 × 40 is a double-glazed roof window for the most common cut-out on converted vans, with 100 cm² of permanent ventilation: air keeps flowing with the window closed. It fits flat and corrugated roofs directly, with no adapter frame.

Choosing the right version

The size shown is the cut-out size in the roof: 400 × 400 mm. The frames overhang on each side — allow up to 130 mm more in width and 110 mm more in height for the interior frame.

• Without permanent ventilation — the window closes fully. The right choice if your conversion does not need an approval airflow, or already has one elsewhere.
• With 100 cm² permanent ventilation (this page) — air keeps flowing with the window closed, against condensation and for vehicle approval. Same window, same price.

💡 Good to know: the warm-white LED inner frame is an option. It runs on 12/24 V and saves adding a separate ceiling light above the same opening. Skip it if you already have lighting at that spot.

Why our customers love the STYLE 40 × 40

• A constant flow of air. 100 cm² of permanent ventilation holds condensation down, and it is what many approval bodies ask for on a converted vehicle.
• The most common cut-out. The reference size on most van layouts, and the easiest to find accessories and spare parts for later.
• Direct fit, no adapter frame. Flat or corrugated roof, it mounts straight on, with the ridges filled with butyl. Fewer intermediate parts means fewer joints that can leak years later.
• Magnetic blackout blind and mosquito net included, for everyday comfort.
• Double-glazed and UV-resistant, opening up to 50°.

What's in the box

• 1 × STYLE 40 × 40 roof window with 100 cm² permanent ventilation
• 1 × Magnetic blackout blind
• 1 × Magnetic mosquito net
• 1 × Full set of screws
• 1 × Fitting guide
• LED inner frame if you pick that version

What you will need

• Sikaflex 552 AT adhesive-sealant, on its own or in our Sikaflex pack for skylights
• On corrugated panels: Sika 831E butyl to fill the ridges — no adapter frame required
• A jigsaw and a cordless drill/driver

Frequently asked questions

Is it road legal?
Yes — ECE R43. It can be fitted without manufacturer approval across Europe, in the UK and in Switzerland, and it passes vehicle inspection in the UK (VCA) and across Europe (e.g. VASP in France, TÜV in Germany, ITV in Spain).

Does this version have permanent ventilation?
Yes, 100 cm². Air keeps flowing with the window closed, which holds condensation down and meets what approval bodies usually ask for on a converted vehicle.

Will it fit my roof thickness?
It takes roof thicknesses from 28 to 70 mm, on a flat or a corrugated roof, with no adapter frame.

How much room does it take?
The cut-out is 400 × 400 mm; allow up to 130 mm more in width and 110 mm more in height for the interior frame. It stands 12 cm above the roof.

A question or a doubt? Our France-based technical team answers within 24 hours, before you buy and while you fit it.